I started working as a Mercedes-Benz mechanic in 1970 and used DuPont Pro-Tek from day one. At the end of the day my hands were always clean. It seems immune to solvents other than water and is an excellent barrier cream. I used it until we started using latex gloves in the early 80's. My dentist used to say that my hands were cleaner than his. The only drawback I found to Pro-Tek is that it seals so well you tend to sweat just a tad more because your hands can't perspire through the barrier.

Stu